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Zr + d reaction cross sections measured at 28 MeV/nucleonChillery, T.*; Hwang, J.*; 堂園 昌伯*; 今井 伸明*; 道正 新一郎*; 炭竃 聡之*; 千賀 信幸*; 大田 晋輔*; 中山 梓介; 他49名*
Progress of Theoretical and Experimental Physics (Internet), 2023(12), p.121D01_1 - 121D01_11, 2023/12
被引用回数：0 パーセンタイル：0.01(Physics, Multidisciplinary)重陽子は弱束縛系でありクーロン力と核力の下で容易に陽子と中性子に分解する。これまでの実験からは、核子当たり50から200MeVといった高入射エネルギーではこの分解過程が残留核生成に大きな影響を与えることが示されている。しかし、核子当たり50MeV以下のエネルギーでの断面積データはまだ不足している。本研究では、BigRIPSセパレータ、OEDOビームライン、SHARAQスぺクトロメータを用いて、Zr+d反応断面積を核子当たり約28MeVにおいて逆運動学法を用いて測定した。本研究で得られた断面積を過去の測定結果や理論計算と比較した。重陽子の分解の効果を定量的に考慮したDEURACS計算により実験データがよく再現された。本研究で測定された低エネルギー領域におけるデータは、将来の核廃棄物処理施設の検討に役立つと考えられる。
橋本 直*; 谷田 聖; 他49名*
IEEE Transactions on Applied Superconductivity, 27(4), p.2100905_1 - 2100905_5, 2017/06
被引用回数：12 パーセンタイル：54.67(Engineering, Electrical & Electronic)We are developing a new technique to apply transition-edge sensors (TESs) to X-ray spectroscopy of exotic atoms, especially of kaonic atoms. To demonstrate the feasibility of this pioneering project, performance of a TES-based X-ray detector was evaluated in pion- and kaon-beam environments at particle accelerators. We successfully observed X-rays from pionic-carbon atoms with a resolution as good as 7 eV FWHM at 6 keV. Also at a kaon beamline, we confirmed that the TES spectrometer will be able to achieve our resolution goal, 6 eV, in our first scientific campaign to measure X-rays from kaonic-helium atoms.
橋本 直*; 谷田 聖; 他49名*
no journal, ,
We are developing a new technique to study the strong interaction between a hadron and an atomic nucleus: high-resolution TES-based X-ray spectroscopy of hadronic atoms. The strong interaction induces a shift and broadening of the atomic energy levels from their purely electromagnetic values. Thus, precise measurements of the X-ray-emission lines of a hadronic atom can reveal the hadron-nucleus strong interaction at zero kinetic energy. Presently, we are preparing to measure the 
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X-ray lines of kaonic helium-3 and helium-4 (6.2 keV and 6.4 keV, respectively) at the Japan Proton Accelerator Research Complex (J-PARC; Tokai, Japan). If we determined the strong-force shift in the helium 2p orbital to a precision of 0.2 eV, we could distinguish between the two leading antikaon-nucleus strong-interaction models. Here, we plan to use a 240-pixel TES array of about 23 mm
collecting area with 4 
m thick Bi absorbers. Our project represents the first attempt to use a TES-based X-ray spectrometer in a charged-particle beamline, and we have identified some challenges: (1) energy resolution is deteriorated by charged-particle passages; (2) a continuum background in the X-ray spectrum is generated by charged particles; (3) the science X-ray yield is expected to be very low, at 200 counts per week for the kaonic-helium-atom experiment. Here we present the status of our project.
